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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes, Earnings per Share and Unit and Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes |  |  |
Net tax basis in the entity's assets | $ 6,113.5 | $ 4,384.1 |
Percentage of distributions characterized as ordinary income dividends | 92.6365% |  |
Percentage of distributions characterized as capital gain dividends | 7.3635% |  |
Federal excise tax rate (as a percent) | 4.00% |  |
Percentage of ordinary income considered for the calculation of annual amount which is subject to federal excise tax | 85.00% |  |
Percentage of net capital gain considered for the calculation of annual amount which is subject to Federal excise tax | 95.00% |  |
Percentage of prior year taxable income considered for the calculation of annual amount which is subject to federal excise tax | 100.00% |  |
Sales and Excise Tax Payable | $ 0.0 | 0.0 | $ 0.0
Net deferred tax liability | $ 0.7 |  |
Net deferred tax assets |  | $ 0.4 |
Earnings per Share and Unit |  |  |
Potential dilutive securities included in the calculation of diluted earnings per share (in shares) | 1,176,000 | 796,000 | 702,000
Foreign currency |  |  |
Derivatives outstanding | $ 0.0 | $ 0.0 |
Impairment | 0.0 | $ 0.0 | $ 0.0
Equity method investment, difference between carrying amount and underlying equity | $ 33.6 |  |

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